mod_pagespeed
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I've seen only a single post regarding this so I'll assume awareness of this project isn't evry high. I recently stumbled upon mod_pagespeed, which is a module for the Apach Webserver that pretty much does everything to comply to the hints by Google's Page Speed tests.

I just took a small glance at it, but the overall impression is pretty good. I pushed two of my yii-based projects through it and haven't encountered any problems so far. You shouldn't set this up on your dev-machines, though. mod_pagespeed's cache will last for a year by default

programmer /ˈprəʊgramə/, noun: a device that converts ►coffee into ►code

A version for nginx has been released today. I can't make up to which versions of nginx this module is compatible and it doesn't seem to come as an rpm from the mod_pagespeed repo. I see some hints it might work with versions as early as v0.8.x ... Anybody tried that yet?

edit: I just realized nginx modules do not really come as .so's, which is significantly reducing the chances to ever see a packaged binary version of this module.

programmer /ˈprəʊgramə/, noun: a device that converts ►coffee into ►code

For what it matters, we are using mod_pagespeed with Yii on www.softworld.com and it works perfect for us.
It takes a while till you get the right directives, especially if there's a CDN involved like in the above example, but when you do know how it works, it's just another tool you wish you have had for a while now (just like apc or fileinfo for php).
Overall, a great module.